Robert Downey Jr. Joins Zach Galifianakis In Todd Phillip's 'Due Date'

If we needed a barometer of how far Todd Phillips has come this year…

Wow. Robert Downey Jr. will now star along side Zach Galifianakis in Phillip’s follow up to “The Hangover,” fellow road trip comedy “Due Date.” That is some crazy inspired casting.

A recent script review revealed that “Due Date” will follow a “worrywart” protagonist and a man-child who are kicked off a plane together and are forced to take a road trip in an attempt for the protagonist to return home in time for the birth of his child. While the first two acts of the film are described as run-of-the-mill road-trip-comedy stuff, the final third reportedly explores emotional ground that provides the film a “jolt.”

Downey Jr. is set to play the “worrywart” expectant father while Galifianakis will of course play the man-child. Great combination especially for a film Phillips described as “a buddy comedy without the buddies.” Downey Jr. and Galifianakis going at it toe to toe? Yes please.

Shooting on the film is set to begin in September in Atlanta, Arizona and Los Angeles for a tentative June 2010 release. Holy crap, we’re stoked. [BFDealmemo]